mirror/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-01-18 21:12:26 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions
mariadb/mysql-test/main/in_subq_cond_pushdown.test
Galina Shalygina 7a77b221f1 MDEV-7486: Condition pushdown from HAVING into WHERE 
Condition can be pushed from the HAVING clause into the WHERE clause
if it depends only on the fields that are used in the GROUP BY list
or depends on the fields that are equal to grouping fields.
Aggregate functions can't be pushed down.

How the pushdown is performed on the example:

SELECT t1.a,MAX(t1.b)
FROM t1
GROUP BY t1.a
HAVING (t1.a>2) AND (MAX(c)>12);

=>

SELECT t1.a,MAX(t1.b)
FROM t1
WHERE (t1.a>2)
GROUP BY t1.a
HAVING (MAX(c)>12);

The implementation scheme:

1. Extract the most restrictive condition cond from the HAVING clause of
   the select that depends only on the fields that are used in the GROUP BY
   list of the select (directly or indirectly through equalities)
2. Save cond as a condition that can be pushed into the WHERE clause
   of the select
3. Remove cond from the HAVING clause if it is possible

The optimization is implemented in the function
st_select_lex::pushdown_from_having_into_where().

New test file having_cond_pushdown.test is created.
2019-02-17 23:38:44 -08:00

862 lines
17 KiB
Text
Raw Blame History

LET $no_pushdown=
SET STATEMENT optimizer_switch='condition_pushdown_for_subquery=off' FOR;
CREATE TABLE t1 (a INT, b INT, c INT, d INT);
CREATE TABLE t2 (e INT, f INT, g INT);
CREATE TABLE t3 (x INT, y INT);
INSERT INTO t1 VALUES
(1,1,18,1), (2,1,25,1), (1,3,40,1), (2,3,40,4),
(4,2,24,4), (3,2,23,1), (1,2,40,2), (3,4,17,2),
(5,5,65,1), (2,3,70,3), (1,4,35,3), (2,3,25,3),
(2,2,40,4), (1,4,55,1), (5,3,72,4), (1,2,70,5);
INSERT INTO t2 VALUES
(1,2,38), (2,3,15), (1,3,40), (1,4,35),
(2,2,70), (3,4,23), (5,5,12), (5,4,17),
(3,3,17), (4,2,24), (2,5,25), (5,1,65);
INSERT INTO t3 VALUES
(1,25), (1,18), (2,15), (4,24),
(1,35), (3,23), (3,17), (2,15);
CREATE VIEW v1 AS
(
SELECT t3.x AS v1_x, t3.y AS v1_y FROM t3 WHERE t3.x<=3
);
CREATE VIEW v2 AS
(
SELECT t2.e, t2.f, MAX(t2.g) AS max_g
FROM t2
GROUP BY t2.e
HAVING max_g>25
);
--echo # conjunctive subformula : pushing into HAVING
LET $query=
SELECT * FROM t1
WHERE t1.c<25 AND
(t1.a,t1.c) IN (SELECT t2.e,MAX(t2.g) FROM t2 WHERE t2.e<5 GROUP BY t2.e);
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # extracted AND formula : pushing into HAVING
LET $query=
SELECT * FROM t1
WHERE t1.c>55 AND t1.b<4 AND
(t1.a,t1.b,t1.c) IN
(
SELECT t2.e,t2.f,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # extracted OR formula : pushing into HAVING
LET $query=
SELECT * FROM t1
WHERE (t1.c>60 OR t1.c<25) AND
(t1.a,t1.b,t1.c) IN
(
SELECT t2.e,t2.f,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # extracted AND-OR formula : pushing into HAVING
LET $query=
SELECT * FROM t1
WHERE ((t1.c>60 OR t1.c<25) AND t1.b>2) AND
(t1.a,t1.b,t1.c) IN
(
SELECT t2.e,t2.f,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula : pushing into HAVING
LET $query=
SELECT * FROM t1
WHERE ((t1.a<2 OR t1.d>3) AND t1.b>1) AND
(t1.a,t1.b,t1.c) IN
(
SELECT t2.e,t2.f,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # using view IN subquery defINition : pushing into HAVING
LET $query=
SELECT * FROM t1
WHERE t1.c>20 AND
(t1.a,t1.c) IN
(
SELECT v1_x,MAX(v1_y)
FROM v1
WHERE v1_x>1
GROUP BY v1_x
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # using equality : pushing into WHERE
LET $query=
SELECT * FROM t1,v1
WHERE t1.c>20 AND t1.c=v1_y AND
(t1.a,t1.c) IN
(
SELECT t2.e,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula : pushing into WHERE
LET $query=
SELECT * FROM t1
WHERE t1.a<2 AND
(t1.a,t1.c) IN
(
SELECT t2.e,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # extracted AND formula : pushing into WHERE
LET $query=
SELECT * FROM t1
WHERE t1.a>2 AND t1.a<5 AND
(t1.a,t1.c) IN
(
SELECT t2.e,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # extracted OR formula : pushing into WHERE
LET $query=
SELECT * FROM t1
WHERE (t1.a<2 OR t1.a>=4) AND
(t1.a,t1.c) IN
(
SELECT t2.e,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # extracted AND-OR formula : pushing into WHERE
LET $query=
SELECT * FROM t1
WHERE ((t1.a<2 OR t1.a=5) AND t1.b>3) AND
(t1.a,t1.b,t1.c) IN
(
SELECT t2.e,t2.f,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e,t2.f
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # extracted AND-OR formula : pushing into WHERE
LET $query=
SELECT * FROM t1
WHERE ((t1.a<2 OR t1.a=5) AND t1.b>3) AND
(t1.a,t1.b,t1.c) IN
(
SELECT t2.e,t2.f,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e,t2.f
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula : pushing into WHERE
LET $query=
SELECT * FROM t1
WHERE ((t1.b<3 OR t1.d>2) AND t1.a<2) AND
(t1.a,t1.b,t1.c) IN
(
SELECT t2.e,t2.f,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # using equalities : pushing into WHERE
LET $query=
SELECT * FROM t1
WHERE t1.d=1 AND t1.a=t1.d AND
(t1.a,t1.c) IN
(
SELECT t2.e,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # using equality : pushing into WHERE
LET $query=
SELECT * FROM t1
WHERE t1.d>1 AND t1.a=t1.d AND
(t1.a,t1.c) IN
(
SELECT t2.e,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # using view IN subquery definition : pushing into WHERE
LET $query=
SELECT * FROM t1
WHERE t1.a<3 AND
(t1.a,t1.c) IN
(
SELECT v1_x,MAX(v1_y)
FROM v1
WHERE v1_x>1
GROUP BY v1_x
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # using equality : pushing into WHERE
LET $query=
SELECT * FROM t1,v1
WHERE t1.a=v1_x AND v1_x<2 AND v1_y>30 AND
(t1.a,t1.c) IN
(
SELECT t2.e,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula : pushing into WHERE
--echo # extracted OR formula : pushing into HAVING
LET $query=
SELECT * FROM t1
WHERE ((t1.b<3 OR t1.b=4) AND t1.a<3) AND
(t1.a,t1.b,t1.c) IN
(
SELECT t2.e,t2.f,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula using addition : pushing into HAVING
LET $query=
SELECT * FROM t1
WHERE (t1.a+t1.c>41) AND
(t1.a,t1.c) IN
(
SELECT t2.e,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula using substitution : pushing into HAVING
LET $query=
SELECT * FROM t1
WHERE (t1.c-t1.a<35) AND
(t1.a,t1.c) IN
(
SELECT t2.e,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula using multiplication : pushing into HAVING
LET $query=
SELECT * FROM t1
WHERE (t1.c*t1.a>100) AND
(t1.a,t1.c) IN
(
SELECT t2.e,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula using division : pushing into HAVING
LET $query=
SELECT * FROM t1
WHERE (t1.c/t1.a>30) AND
(t1.a,t1.c) IN
(
SELECT t2.e,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula using BETWEEN : pushing into HAVING
LET $query=
SELECT * FROM t1
WHERE (t1.c BETWEEN 50 AND 100) AND
(t1.a,t1.c) IN
(
SELECT t2.e,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula using addition : pushing into WHERE
LET $query=
SELECT * FROM t1
WHERE (t1.a+t1.b > 5) AND
(t1.a,t1.b,t1.c) IN
(
SELECT t2.e,t2.f,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e,t2.f
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula using substitution : pushing into WHERE
LET $query=
SELECT * FROM t1
WHERE (t1.a-t1.b > 0) AND
(t1.a,t1.b,t1.c) IN
(
SELECT t2.e,t2.f,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e,t2.f
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula using multiplication : pushing into WHERE
LET $query=
SELECT * FROM t1
WHERE (t1.a*t1.b > 6) AND
(t1.a,t1.b,t1.c) IN
(
SELECT t2.e,t2.f,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e,t2.f
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula using division : pushing into WHERE
LET $query=
SELECT * FROM t1
WHERE (t1.b/t1.a > 2) AND
(t1.a,t1.b,t1.c) IN
(
SELECT t2.e,t2.f,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e,t2.f
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula using BETWEEN : pushing into WHERE
LET $query=
SELECT * FROM t1
WHERE (t1.a BETWEEN 1 AND 3) AND
(t1.a,t1.c) IN
(
SELECT t2.e,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula : pushing into HAVING of the IN subquery
--echo # conjunctive subformula : pushing into WHERE of the view from the IN subquery
LET $query=
SELECT * FROM t1
WHERE t1.c>3 AND
(t1.a,t1.b,t1.c) IN
(
SELECT v2.e,MAX(v2.f),v2.max_g
FROM v2
WHERE v2.e<5
GROUP BY v2.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula : pushing into WHERE of the IN subquery
--echo # conjunctive subformula : pushing into WHERE of the view
--echo # from the IN subquery
LET $query=
SELECT * FROM t1
WHERE t1.a>1 AND
(t1.a,t1.b,t1.c) IN
(
SELECT v2.e,MAX(v2.f),v2.max_g
FROM v2
WHERE v2.e<5
GROUP BY v2.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula : pushing into WHERE and HAVING
--echo # of the IN subquery
--echo # conjunctive subformula : pushing into WHERE of the view
--echo # from the IN subquery
LET $query=
SELECT * FROM t1
WHERE t1.a>1 AND t1.c<100 AND
(t1.a,t1.b,t1.c) IN
(
SELECT v2.e,MAX(v2.f),v2.max_g
FROM v2
WHERE v2.e<5
GROUP BY v2.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula : pushing into WHERE of the IN subquery
--echo # extracted AND formula : pushing into HAVING of the derived table
--echo # from the IN subquery
LET $query=
SELECT * FROM t1
WHERE t1.a>1 AND
(t1.a,t1.b,t1.c) IN
(
SELECT d_tab.e,MAX(d_tab.f),d_tab.max_g
FROM
(
SELECT t2.e, t2.f, MAX(t2.g) AS max_g
FROM t2
GROUP BY t2.f
HAVING max_g>25
) as d_tab
WHERE d_tab.e<5
GROUP BY d_tab.e
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula : pushing into HAVING of the derived table
--echo # conjunctive subformula : pushing into WHERE of the IN subquery from
--echo # the derived table
SELECT *
FROM t3,
(
SELECT t1.a,t1.b,max(t1.c) as max_c
FROM t1
WHERE t1.a>1 AND
(t1.a,t1.b,t1.c) IN
(
SELECT t2.e,t2.f,MAX(t2.g)
FROM t2
WHERE t2.e<5
GROUP BY t2.e
)
GROUP BY t1.a
) AS d_tab
WHERE d_tab.a=t3.x AND d_tab.b>2;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula : pushing into WHERE of the derived table
--echo # extracted AND formula : pushing into WHERE of the IN subquery from
--echo # the derived table
SELECT *
FROM t3,
(
SELECT t1.a,t1.b,max(t1.c) as max_c
FROM t1
WHERE t1.a>1 AND
(t1.a,t1.b,t1.c) IN
(
SELECT t2.e,t2.f,MAX(t2.g)
FROM t2
GROUP BY t2.e
HAVING t2.f<5
)
GROUP BY t1.a
) AS d_tab
WHERE d_tab.a=t3.x AND d_tab.a<5;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula : pushing into WHERE and HAVING
--echo # of the derived table
--echo # extracted AND formula : pushing into WHERE of the IN subquery
--echo # from the derived table
LET $query=
SELECT *
FROM t3,
(
SELECT t1.a,t1.b,max(t1.c) as max_c
FROM t1
WHERE t1.a>1 AND
(t1.a,t1.b,t1.c) IN
(
SELECT t2.e,t2.f,MAX(t2.g)
FROM t2
GROUP BY t2.e
HAVING t2.f<5
)
GROUP BY t1.a
) AS d_tab
WHERE d_tab.a=t3.x AND d_tab.a<5 AND d_tab.max_c<70;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula : pushing into WHERE of the derived table
--echo # conjunctive subformula : pushing into HAVING of the IN subquery from
--echo # the derived table
SELECT *
FROM t3,
(
SELECT t1.a,t1.b,max(t1.c) as max_c
FROM t1
WHERE (t1.a,t1.b,t1.c) IN
(
SELECT t2.e,t2.f,MAX(t2.g)
FROM t2
WHERE t2.f<4
GROUP BY t2.f
)
GROUP BY t1.a
HAVING t1.b<5
) AS d_tab
WHERE d_tab.a=t3.x AND d_tab.a<5;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula : pushing into WHERE
--echo # using WINDOW FUNCTIONS : using MAX function
LET $query=
SELECT * FROM t1
WHERE (t1.b>1) AND
(t1.b, t1.c) IN
(
SELECT t2.f, MAX(t2.g) OVER (PARTITION BY t2.f)
FROM t2
WHERE t2.e<5
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
--echo # conjunctive subformula : pushing into WHERE
--echo # using WINDOW FUNCTIONS : using SUM function
LET $query=
SELECT * FROM t1
WHERE (t1.b>1) AND
(t1.b, t1.c) IN
(
SELECT t2.f, CAST(SUM(t2.g) OVER (PARTITION BY t2.f) AS INT)
FROM t2
WHERE t2.e<5
)
;
EVAL $no_pushdown $query;
EVAL $query;
EVAL EXPLAIN $query;
EVAL EXPLAIN FORMAT=JSON $query;
DROP TABLE t1,t2,t3;
DROP VIEW v1,v2;
--echo #
--echo # MDEV-16721: IN-subquery defined with the AUTO-INCREMENT column
--echo # and used with the ZEROFILL column
--echo #
CREATE TABLE t1 (a INT AUTO_INCREMENT PRIMARY KEY);
CREATE TABLE t2 (b INT ZEROFILL);
INSERT INTO t2 VALUES (2), (3);
SELECT *
FROM t2
WHERE t2.b IN (SELECT MIN(t1.a) from t1);
DROP TABLE t1, t2;
--echo #
--echo # MDEV-16730: server fault caused by pushdown into the derived table
--echo # condition that joins IN subquery and parent select
--echo #
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1), (2), (3);
SELECT *
FROM (SELECT DISTINCT * FROM t1) AS tbl
WHERE tbl.a IN
(
SELECT COUNT(t1.a)
FROM t1
WHERE (t1.a!=1)
);
DROP TABLE t1;
--echo #
--echo # MDEV-16727: failure assertion caused by the lamely saved list
--echo # of multiple equalities
--echo #
CREATE TABLE t1 (a varchar(1));
INSERT INTO `t1` VALUES ('x'), ('y'), ('z');
CREATE TABLE t2 (b varchar(1));
INSERT INTO t2 VALUES ('x');
CREATE TABLE t3 (c varchar(1));
INSERT INTO t3 VALUES ('y');
CREATE TABLE t4 (d varchar(1));
INSERT INTO t4 VALUES ('x'), ('z');
# SELECT * FROM t1
# JOIN t2 ON (t1.a=t2.b)
# LEFT JOIN t3 ON (t1.a=t3.c)
# WHERE (t1.a) IN
# (
# SELECT t4.d
# FROM t4
# ORDER BY t4.d
# );
DROP TABLE t1,t2,t3,t4;
--echo #
--echo # MDEV-17360: IN subquery predicate with outer reference in the left part
--echo # that refers to a field of a mergeable derived table
--echo #
CREATE TABLE t1 (id1 int) ENGINE=MYISAM;
INSERT INTO t1 VALUES (1814),(0),(NULL),(1);
CREATE TABLE t2 (id2 int) ENGINE=MYISAM;
SELECT 1 AS r FROM t2,t1,(SELECT * FROM t1) dt1
WHERE NOT EXISTS (SELECT id2 FROM t2
WHERE dt1.id1 IN (SELECT t2.id2 FROM t2
HAVING t2.id2 >= 1));
DROP TABLE t1,t2;
--echo #
--echo # MDEV-17027: IN subquery predicate with outer reference in the left part
--echo # conjuncted with equality predicate
--echo #
CREATE TABLE t1 (pk int, i1 int, v1 varchar(1));
INSERT INTO t1 VALUES (3,2,'x'), (1,1,'y'), (4,2,'z');
CREATE TABLE t2 (pk int, i1 int, v1 varchar(1));
INSERT INTO t2 VALUES (5,2,'x'), (7,1,'x');
CREATE TABLE t3 (pk int, i1 int, v1 varchar(1));
INSERT INTO t3 VALUES (8,2,'x'), (7,1,'z');
SELECT t3.i1 FROM t3
WHERE EXISTS ( SELECT t2.v1 FROM t1,t2
WHERE t1.v1 = t2.v1 AND
t3.i1 IN (SELECT t.i1 FROM t1 as t
GROUP BY i1 HAVING t.i1 < 3));
DROP TABLE t1,t2,t3;
Reference in a new issue View git blame Copy permalink